The Most Useful Japanese Grammar : Adj + する
In Japanese, we often use 「Adjective + する」 to express “to make something ~” or “to become ~.”
It’s a useful and natural pattern in daily conversation!
1. What It Means
Let’s talk about what it means. When we attach する to an い-adjective or な-adjective, it means “to make (something) ~” or “to make it become ~.”
In English, this is like saying “make it clean,” “make it quiet,” “make it simple,” etc.
2. How to Form It
🟢 For い-adjectives:
Remove い and add くする
い-Adjective → くする
Examples:
- 高い → 高くする
- (make it expensive / raise the price)
- 早い → 早くする
- (make it fast / hurry up)
- 新しい → 新しくする
- (make it new / renew)
🟣 For な-adjectives:
Add にする after the adjective
な-Adjective → にする
Examples:
- きれい → きれいにする
- (make it clean / tidy up)
- 静か → 静かにする
- (make it quiet)
- 簡単 → 簡単にする
- (make it simple)
3. Example Sentences
- 部屋をきれいにしました。
- → I cleaned the room. (I made the room clean.)
- 音を小さくしてください。
- → Please make the sound smaller (turn down the volume).
- 服を新しくしたいです。
- → I want to make (my) clothes new / get new clothes.
- もっと静かにしてください。
- → Please be quieter.
- 値段を安くします。
- → I’ll make the price cheaper.
4. Adjective + なる vs Adjective + する
Be careful because it might be easy to mix up なる and する, but the difference is simple:
| Pattern | Meaning | Focus | Example |
|---|---|---|---|
| Adjective + なる | to become ~ | change happens naturally | きれいになる → become clean |
| Adjective + する | to make ~ | you cause the change | きれいにする → make (something) clean |
🪄 Think of なる as “it becomes” and する as “I make it become.”
🧠 Practice Time
Try to make sentences using Adjective + する!
- I make your room clean → __________
- Please make the sound smaller → __________
- They made the price cheaper → __________
- Let’s make the color bright → __________
- Make the explanation simple → __________
- Make your hair long → __________
- We should make the food spicy → __________
- I want to make my team stronger → __________
- Make the room quiet → __________
- Make the story interesting → __________
✅ Answers:
- 部屋をきれいにする
- 音を小さくしてください
- 値段を安くしました
- 色を明るくしましょう
- 説明を簡単にする
- かみを長くする
- 食べ物をからくするべきです
- チームを強くしたい
- 部屋を静かにする
- 話をおもしろくする
I hope this post helps! Feel free to let us know in the comment if you have any questions!
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